<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片页 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        :closable="false"
        show-icon
        type="warning">
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
        <el-cascader
          v-model="selectedCateKeys"
          :options="catelist"
          :props="cateProps"
          @change="handleChange">
        </el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" :disabled="idBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table
            :data="manyTableData"
            stripe
            border
          >
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                closable
                v-for="(item, index) in scope.row.attr_vals"
                :key="index"
                @close="handleClose(scope.row, index)"
                >
                  {{item}}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" :disabled="idBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table
            :data="onlyTableData"
            stripe
            border
          >
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag
                closable
                v-for="(item, index) in scope.row.attr_vals"
                :key="index"
                @close="handleClose(scope.row, index)"
                >
                  {{item}}
                </el-tag>
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      @close="addDialogClosed"
      width="50%">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      @close="editDialogClosed"
      width="50%">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      catelist: [],
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedCateKeys: [],
      activeName: 'many',
      manyTableData: [],
      onlyTableData: [],
      addDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      addFormRules: {
        attr_name: [
          {
            required: true,
            message: '请填写'
          }
        ]
      },
      editDialogVisible: false,
      editForm: {
        attr_name: ''
      },
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请填写'
          }
        ]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败')
      this.catelist = res.data
    },
    // 级联选择切换
    handleChange () {
      this.getParamsData()
    },
    // Tab页签点击事件的处理
    async handleTabClick () {
      this.getParamsData()
    },
    // 获取面板参数
    async getParamsData () {
      if (this.selectedCateKeys.length < 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return undefined
      }
      // 根据所选分类的id和所选面板，获取对应数据
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {
          sel: this.activeName
        }
      })
      if (res.meta.status !== 200) this.$message.error('获取数据失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    addParams () {
      this.$refs.addFormRef.validate(async validate => {
        if (!validate) return undefined
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败')
        this.getParamsData()
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
      })
    },
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) this.$message.error('获取参数失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    editParams () {
      this.$refs.editFormRef.validate(async validate => {
        if (!validate) return undefined
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败')
        this.getParamsData()
        this.$message.success('修改参数成功')
        this.editDialogVisible = false
      })
    },
    async removeParamById (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，confirmResult返回值为confirm，取消删除confirmResult为cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除失败')
      }
      this.$message.success('删除成功')
      this.getParamsData()
    },
    // 文本框失去了焦点，或者摁下了Enter键
    handleInputConfirm (param) {
      if (param.inputValue.trim().length === 0) {
        param.inputValue = ''
        param.inputVisible = false
        return undefined
      }
      param.attr_vals.push(param.inputValue)
      param.inputValue = ''
      param.inputVisible = false
      this.saveAttrVals(param)
    },
    async saveAttrVals (param) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${param.attr_id}`, {
        attr_name: param.attr_name,
        attr_sel: param.attr_sel,
        attr_vals: param.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数项失败')
      this.$message.success('修改参数项成功')
    },
    showInput (param) {
      param.inputVisible = true
      // $nextTick当页面元素被重新渲染之后才会执行回调函数中的代码，因为param.inputVisible被设为true了，但是页面上input可能还未被渲染完
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数的选项
    handleClose (param, index) {
      param.attr_vals.splice(index, 1)
      this.saveAttrVals(param)
    }
  },
  computed: {
    idBtnDisabled () {
      return this.selectedCateKeys.length !== 3
    },
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return -1
    },
    titleText () {
      return this.activeName === 'many' ? '动态参数' : '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 10px 0
  }
  .el-cascader {
    width: 300px
  }
  .input-new-tag {
    width: 120px
  }
  .el-tag {
    margin: 5px
  }
</style>
